Positivity Preserving Interpolation Using Rational Bicubic Spline

Table 3

Positive surface data from function .

	0	2	4	6
0	1.33000	0.011261	0.10505	0.41710
2	1.79240	0.619300	0.39739	0.45990
4	0.41370	0.020814	0.16294	0.33635
6	0.39537	0.281670	0.30087	0.33560